| Based on the detailed and abroad investigation of the inland and overseas literatures of three- dimensional turbulence computation in recent years, the numerical simulation of 3D tidal flow and mass transportation based on POM is built. First, the methods of tidal current numerical modeling are commented, and the analysis for the development situation of tidal current numerical modeling is made. Second, the numerical procedure for the generation of orthogonal body-fitted coordinate systems with direct determination of grid points on the boundary is presented, moreover, the turbulence control equations in body-fitted coordinate and a coordinate were constructed from equations in Cartesian coordinate, and the boundary conditions and initial conditions are analyzed. Then the discretization grid and difference schemes are presented. The mode-splitting solution technique is applied in this model. Eddy viscosity coefficients are analyzed and the calculation of two theoretical examples are taken for analysis ofthe influence of the vertical eddy viscosity coefficient( KM) on 3-D numerical simulation. Basedon POM model the computations of wind induced current in a closed rectangular basin, current in open channel and tidal current of Taicang part of Yangzi river are taken, the computed results are satisfied. The study of this paper is significant to solve the pollution in tidal river. |
